Another idea. well, a couple ideas. Have a special area on the site that teaches you about the enemies in the game, their total attack damage, health, strengths and weaknesses, and maybe for a good laugh, the type of food they like ;)

And the second idea, a private list for all the players so they can see the enemies they personally killed going solo and on teams not in the battlefield. Also a list that shows them a battlefield win:loss ratio so they can compare it with other players.